Researchers work at a laboratory of the disease prevention and control center in Nanyang, central China's Henan Province, Feb. 4, 2020. Since the outbreak of pneumonia caused by the novel coronavirus, the disease prevention and control center in Nanyang has taken on the task to carry out testing the coronavirus nucleic acid of the samples collected from local designated hospitals, conduct epidemic monitoring and statistical analysis. (Photo by Hao Yuan/Xinhua)